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Welcome to the shark portal!
Welcome to the shark portal!

Sharks (superorder Selachimorpha) are a group of fish species with a full cartilaginous skeleton. There are over 400 extant species of shark, as well as numerous extinct species known from recovered teeth and bones. Due partially to fear of shark attack, sharks often feature heavily in popular culture.

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A caught crocodile shark with a ruler for size comparison
The crocodile shark, Pseudocarcharias kamoharai, is a species of shark found worldwide in tropical waters. It is the only member of the family Pseudocarcharidae. The crocodile shark is the smallest living mackerel shark, measuring only 1 m (3 ft) long, and can be distinguished by its elongated body, extremely large eyes, and relatively small fins. It is a specialized inhabitant of the open ocean, feeding on pelagic fishes and invertebrates. The size and structure of its eyes indicates that it is adapted for hunting at night. The crocodile shark is ovoviviparous and typically gives birth to litters of four. The fetuses are oophagous, meaning that they feed on eggs produced by the mother. Due to its small size, the crocodile shark is of little commercial importance. However, it is caught in substantial numbers as bycatch, leading it to be assessed as Near Threatened by the World Conservation Union. This species was responsible for damaging deep sea fiberoptic cables when the technology was first deployed in 1985.


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White shark.jpg
Credit: Terry Goss
The great white shark is an exceptionally large lamniform shark found in coastal surface waters in all major oceans.

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Shark · Outline of sharks

Shark orders
Carcharhiniformes (groundsharks) · Cladoselachiformes (extinct) · Eugeneodontida (extinct) · Heterodontiformes (bullhead sharks) · Hexanchiformes (most primitive sharks) · Hybodontiformes (extinct) · Iniopterygia (extinct) · Lamniformes (mackerel sharks) · Orectolobiformes (carpet sharks and relatives) · Pristiophoriformes (sawsharks and relatives) · Squaliformes (gulper sharks, bramble sharks, lantern sharks, rough sharks, sleeper sharks, dogfish sharks and relatives) · Squatiniformes (angel sharks) · Symmoriida (extinct) · Xenacanthida (also known as Xenacantiformes, extinct)

Major species
Basking shark · Blue shark · Bull shark · Great hammerhead · Great white shark · Grey reef shark · Hammerhead shark · Megalodon · Megamouth shark · Nurse shark · Oceanic whitetip shark · Requiem shark · Scalloped hammerhead · Shortfin mako shark · Swellshark · Thresher shark · Tiger shark · Whale shark

Shark biology
Ampullae of Lorenzini · Mermaid's purses · Physical characteristics of sharks · Shark teeth · Shark threat display

Shark-human interaction
Attack (drum lines, International Shark Attack File, Jersey Shore shark attacks of 1916, list of fatal, unprovoked shark attacks in the United States, shark net, shark proof cage, shark suit, Summer of the Shark) · Captivity (shark tunnel) · Conservation (grey nurse shark conservation, Shark Alliance, Shark Conservation Act, Shark Trust) · Fishing (International Land-Based Shark Fishing Association, land-based shark fishing) · Products (shark cartilage, shark finning, shark fin soup, shark liver oil)

Sharks in culture
Sharks in popular culture · The Gulf Stream (painting) · The Headington Shark · "Helicopter Shark" · Jabberjaw · Jaws (film) (Jaws (novel), Jaws (film series)) · Meg: A Novel of Deep Terror · The Physical Impossibility of Death in the Mind of Someone Living · Shark Tale · Sharky & George · Sherman's Lagoon · Street Sharks · Watson and the Shark

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Portal:Marine life
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